'a lot of frustration' is a correct and usable phrase in written English. You can use it to describe the feeling of having difficulty to accomplish something or to achieve a goal. For example, "I have been trying to get a job in the tech field for months, but I am facing a lot of frustration.".
"There's a lot of frustration.
"There was a lot of frustration".
There's a lot of frustration and impatience".
"There's a lot of frustration, a lot of disappointment.
"This releases a lot of frustration in their lives.
"There was a lot of frustration," she said.
"There is a lot of frustration and concerns.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.